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  • radioactive
  • Concerns over nuclear power and nuclear weapons testing in the atmosphere have heightened awareness of the dangers posed by certain kinds of radioactive isotopes, which can indeed be hazardous to human life. (encyclopedia.com)
  • nuclear
  • Briefly, atoms of certain isotopes of most elements possess the property of nuclear spin. (royalsocietypublishing.org)
  • Give an example of each of the following in relation to how energy from an atom can be used: nuclear medicine, environmental applications, industrial applications, space exploration, and radiation therapy. (meritbadge.org)
  • Use the three models to explain the difference between atomic number and mass number and the difference between the atom and nuclear and quark structures of isotopes. (meritbadge.org)
  • hydrogen atom
  • The weakling of the group Hydrogen bonding differs from other uses of the word bond since it is a force of attraction between a hydrogen atom in one molecule and a small atom of high electronegativity in another molecule. (docplayer.net)
  • HYDROGEN BONDS are weak bonds that involve the attraction between a polar molecule with a negative pole and a polar molecule with a hydrogen atom bearing a slight positive charge. (angelfire.com)
  • evaporation
  • Water from which 16 O atoms have preferentially evaporated has a higher ratio of 18 O to 16 O atoms than water that has experienced less evaporation. (classzone.com)
  • ratios
  • But 15 years ago, corresponding author Joseph Skulan, now an adjunct professor at ASU, combined all the factors into a mathematical model that predicted that calcium isotope ratios in blood and urine should be extremely sensitive to bone mineral balance. (healthcanal.com)
  • But if a disease throws the balance off then you ought to see a shift in the calcium isotope ratios. (healthcanal.com)
  • atomic structure
  • They described spects of atomic structure in ninety-two natural elements-from hydrogen to uranium. (theosophical.org)
  • At the time that Besant published her detailed investigations of atomic structure in 1895, scientists believed that atoms lacked any internal structure whatsoever, just as had been assumed by the ancient Greeks. (theosophical.org)
  • differences
  • Students examine several printed color spectra of elements and discuss differences. (nasa.gov)
  • The small differences in mass between the isotopes lead to very small differences in the rates of biologically catalyzed reactions. (nytimes.com)